Improvement in wax-thread sewing-machines



y E. E. & F. BEAN'. Wax-Thread Sewing-Machines.

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m QC@ @bww WMM Wax-Thread Sewing-Machhes. .NO 137528. Pate,nteQ7April-8,1873.

3 Sheetsf-Sheet 3.-

E. E. & F. BEAN.

Wax-Thread Sewing-Machines.

Patented April 8,1873.

"s Pnacsss) UNITED STATES PATENT CEFICE.

EDWIN E. BEAN, OF BOSTON,AND FRANK-BEAN, OF MEDFORD, MASS.

IMPRovEMENT 4IN WAX-'THREAD SEWING-MACHINES.

Specification forming part of Letters Patent No. 137,528, dated April 8,1873 application filed November 11, 1872.

To all whom it may concern:

Be it known that we, EDWIN E. BEAN, of Boston, in the countyV of Suffolkand State of Massachusetts, and FRANK BEAN, of Medford, in the county ofMiddlesex and State of Massachusetts, have jointly invented certain newand useful Improvements in Tax-Thread Sewing-Machines, of which thefollowing is a specication: y l

Our invention consists in a self-adjusting take-up for the tension, ashereinafter described, for the purpose of regulating the amount of loopfor different thicknesses of work; also, in the arrangement foradjusting the `needle centrally with the awl, by means of aregulating-screw and slotted lever, and to the arrangement ofregulating-screws for adjusting the feed-post in a vertical plane 5also, in the means for operating the needle and awl by means of onecrank and connectinglinks and shafts, as described; also, in a springforimpartin g a partial upward movement to the cast-off bar, to preventthe escape of the loop from the needle,until at the proper height; also,in the employment of one single cam and connecting devices for operatingthe threadguide, needle, and awl; also, in an arrangement of parts foradjusting the lift of the footbar by means of an adjustable screwpressing against a seat in the rock-shaft.

This our invention is arranged throughoutin such asimple-and positivemanner that a skillful operator is not needed to run the machine, as themost important moving parts have their positive motions arranged in sucha manner that they need no attention or alteration after once being puttogether. The bearings for the f operating-shafts are cast in one piecewith the frame, by which arrangement great strength and durability isobtained.

On the drawing, Figure l is a side elevation of the machine. Fig. 2 isan end view. Fig. 3 is also a side elevation showing the opposite sideof Fig. l. Fig. 4 is a rear end view, with the iiy-wheel andcord-pulleys detached. Fig. 5 is an enlarged section over the line w ytaken on Fig. 3, and Fig. 6 is a cross-section over the line T U, alsotaken on Fig. 3.

d Similar letters refer to similar parts wherever they occur on thedrawing.

a on the drawing is the frame of the ma chine, secured to the base b bymeans of the screw f, shown in Fig. 6, around which it may be swung. cis the work-plate arranged in the ordinary way. d is the ily-wheel, andc is a cord or belt pulley, to which the motion is imparted from anyordinary source.

Theself-adjusting take-up for the tension is arranged and operated inthe following manner: On the driving-shaft g is keyed or secured acam-wheel, h, that operates a rocking-lever, t', rocking around the pinor fulcrum 7c, as shown. The pin 7c projects through a bearing in theframe a, on the opposite side of which issecured another arm, Z, asshown in Fig. l, Athrough the upper end of which 4 projects aconnecting-rod, m, provided ou its extreme outer end withregulating-nuts n n, as shown. An adjustable collar, o, is slippedoverand secured to the rod m, as shown, and a spiral spring, p,surrounds the rod m between the collar o and the upper end of the leverl. The forward end of the connectingrod m is hinged to an angularrocking-lever, g q', made to rock around the fulcrum r, as shown in Fig.l. Around the same fulcrurn is also movable the disk s, provided with aprojecting arm, t, in which the pin Iu is screwed,

serving as a support for the disk c and tension-roller w. The disk o andtension-roller w are secured together in a suitable manner, as shown inFig. 5, and thel pin u is provided with check-nuts l l and spring 2, bywhich the tension is regulated. The end of the arm tis lifted upward adistance more than the lift of the presser-foot bar 3, by means ot therocking-levers and cams heretofore described; but the descent isgoverned by the arm 4, secured to the presser-foot bar 3, as shown indotted lines on Fig. 5.

The operation of this arrangement is as follows The tension-wheel w andthe bar t are forced downward by the action of the lever t and rod m,operating the knee q that strikes against the pin .r in the disk s atthe'same time as the knee q releases its hold on the circumference ofthe disk n attached to the tension-wheel w, by which operation the bar tis forced down until it strikes the step 4L secured to the presser-footbar 3, during which time the thread on the tension-wheel w is allowed torun off the spool enough to forni a loop long enough for the thickestwork; but as soon as the needle commences to rise up, the lever lreverses the action of the knee q, the end gf of which impinges againstthe disk e on the tension-wheel w, preventing it from turning, by whichoperation the arm t and tension-wheel w are raised upward simultaneouslywith the needle, whereby the loop is pulled up a variable distanceaccording to the thickness of the stock. The spring p is for the purposeof allowing a positivethrow of the lever l toward the tension-wheel fw,so as to allow of the downward variations of the bar t resting on thefoot 4, according to different thicknesses of work. As the said bar talways rises to a positive height, it will be seen that its descent isvariable, according to the thickness of the work. The feed-post is castin one piece with or otherwise secured to the rocking-shaft 6, shown inFigs.4 and 6, and also in dotted lines in Fig. 1. The rocking-shaft 6 ismade to rock in bearings in the frame a, as shown, by means of arockinglever, 7, secured to its rear end, as shown in Fig. 4; the rightend of said lever, as represented on the latter gure, is provided with aslot, 8, in which is an adjustable pin or stud, 9, that engages into theforked end of the angular rocking-lever 10, that is allowed to swingvloosely around the rockin g-shait 11. The upper end of the lever 10 isprovided with a pin and roller that engages in a grooved cam cut on theface of the pulley e, by which the angular lever 10 is operated; thefeed of the needle may easily be changed by moving the stud 9 to theright or left in the slot 8. The proper position of the feed-post andneedle can be adjusted vertically by means of the set-screws 12 12,screwed through the upper part of the lever 7, and resting in recessescut in the shaft 6, as fully shown in Fig. 4. By this arrangement, thegreatest nicety is obtained in adjusting the needle in a vertical plane.The post 5 with its shaft Gis adjusted horizontally in such a mannerthat the needle and awl come centrally over each other, by means oftheset-screw 13 passing through the arched slot 14 in the left end of thelever 7. rlhe set-screw 13 has a collar on each side of the lever 7, as.shown in Fig. l, and the end of said set-screw 13 is screwed in theframe a, as shown; a check-nut, y, secures the screw 13 in place whenproperly adjusted. From this it will be seen that all that is needed toadjust the feed-post 5 and the needle in the direction of the shaft 6 isto turn the set-screw 13 a little to the right or left, and secure it bythe nut y, when the lever 7 will be kept in place by the collars on theset-screw 13 embracing iton both sides. The arched slot 14 allows of afree rocking motion for the lever 7 over the screw 13, as shown anddescribed. The needle-bar 15 and awl-bar 16 are operated by one and thesame crank 17, attached to the cam-wheel 1S in the following manner: Theawl-bar is operated by means of the connecting-rod 19 connecting thecrank-pin 17 and the rockin g-lever 20. The lever 20 is attached i tothe end ofthe rock-shaft 21, movable in bearings 22 22 attached to theframe a, as shown.

To the eXtreme end of the rock-shaft 2l is attached the forked lever 23,shown invdotted lines on Fig. 5. The needle-bar 15 is operated by meansof the pin and roll 17, playing into the slotted arm 25 made to rockaround a pin, 26, secured in the bearing` 27 cast in one piece with theframe a. The slot in the arm 25 is curved in such a manner as to allowthe needle to rest during a part of its stroke, when the other operating*partsV perform their functions. To the rocking-lever 25 is also hingedthe connecting-rod 28 that imparts a rocking motion to the lever 29secured to the rock-sh aft 11 that is movable in bearing 30 30 attachedto the frame a. On the eXtreme forward endof the rock-shaft 11 issecured the lever 3l, the extreme end of which is hinged to theconnecting-rod 32 that connects the lever 31 to the needle-bar 15, asfully shown in Fig. 2, by

which arrangement the needle-bar is always operated with a positivemotion, as fullyr shown and described. The cast-off bar 33 has a partialupward movement given to it by means of the spring 38, that commences tolift it as soon as the cross-bar 35 releases it, by which operation thecast-off follows with the needle until it is of the proper height toprevent the escape of the loop from the hook, by which arrangement theneedle is always sure to pass through the loop. The cam 18 is grooved onits periphery, and, besides operating the needle-bar and awl-bar, italso serves another purpose, namely, that of operating the thread-guidebar 40. rlhis is done by the rocking-lever 4l, movable around thefulcrum 42. The lower end of said lever engages with the grooved cam 1S,and the upper end of the said lever is jointed to the connecting-rod 43that is connected to a crank on the upper end of the thread-guide bar inthe usual way.

The arrangement for adjusting the lift of the foot-bar 3 is carried outin the following manner: On the presser-foot bar 3 is secured a hub, 44,provided with a horizontal projection, 45, and a downward-projectingrod, 46, as fully shown in Fig. 5. On the rocking-shaft 21 is attachedan adjustable lever, 47, the end of which liftsthe rod 46, and with itthe presserfoot bar 3, upward a distance according to the thicknessofthe material that is operated upon. A hat spring, 4S, presses down thehorizontal arm 45 as soon as the lever 47 ceases to act upon theprojection 46. In the shaft 21 is cut a recess, 49, and through the hubof the lever 47 is tapped a hole for the reception of a screw, 50, theinner end of which rests against the recess 49, as shown in Fig. 5.

When it is desired to increase the lift of the presser-foot bar 3 allthat is necessary to do is to turn the screw 50 down a little in therecess 49, when the lever 47 will be-raised, and it will thus commenceto lift the foot-bar 3 at an earlier part of the stroke, whereby thelift of the said presser-foot bar is increased. If the lil't the screw50 in the opposite Way.

Having thus fully described the nature, construction, and operation ofour invention, We

ish to secure by Letters Patent and claim-A 1. The tension-roller w,disk v, arm t s, and knee q q', in combination with the rod m, spring p,levers Z i, cam h, and the presser-foot bar 3 with its step 4, `allconstructed and arranged 4 substantially as and for the purpose setforth.

2. The mechanism for adjusting the needle centrally with the awl,consisting'of the slotted lever 7 attached to the shaft 6 andadjusting-screw 13, or their equivalents, as and for the purpose shownand described. p

3. The mechanism for adjusting the feed-post in a vertical plane,consisting of the screws 12 12 tapped through the lever 7 and resting inrecesses made in the shaft 6, as shown and described.

4. The combination, with a needle-bar and of the presser-foot bar is toben decreased, turn awl-bar, of the single crank g and its connectingmechanism for imparting the respective movements to the said bars.

. 5. The spring 38, arranged to sli ghtljr eleva-te the cast-oft' bar,to prevent the escape of the loop from the needle as it begins to rise,as described.

6. The combination, with a needle-awl and 'thread-guide, of a singlecam-disk, 18, and its connected mechanism for imparting the rcspectivemovements to'the said parts.

7. A shaft, 2l, with its seat 49, in which the adjustable screw 50,tapped through the arm 47, rests, for the purpose of adjusting theposition of the arm in relation to the shaft 21, as herein shown anddescribed.

' EDWIN E. BEANs FRANK BEAN. Witnesses:

WM. H. HUTCHINsoN, ALBAN ANDRN.

